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gdb: ensure the cast in gdbarch_tdep is valid

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This commit makes use of gdb::checked_static_cast when casting the
generic gdbarch_tdep pointer to a specific sub-class type.  This means
that, when compiled in developer mode, GDB will validate that the cast
is correct.

In order to use gdb::checked_static_cast the types involved must have
RTTI, which is why the gdbarch_tdep base class now has a virtual
destructor.

Assuming there are no bugs in GDB where we cast a gdbarch_tdep pointer
to the wrong type, then there should be no changes after this commit.

If any bugs do exist, then GDB will now assert (in a developer build).
This commit is contained in:
Andrew Burgess 2022-05-19 13:55:41 +01:00
parent 11da1b13b3
commit c44885db3b
1 changed files with 10 additions and 2 deletions
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12
gdb/gdbarch.h
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@ -28,6 +28,7 @@
#include "infrun.h"
#include "osabi.h"
#include "displaced-stepping.h"
#include "gdbsupport/gdb-checked-static-cast.h"
struct floatformat;
struct ui_file;
@ -58,7 +59,14 @@ struct inferior;
#include "regcache.h"
struct gdbarch_tdep {};
/* The base class for every architecture's tdep sub-class. The virtual
destructor ensures the class has RTTI information, which allows
gdb::checked_static_cast to be used, the gdbarch_tdep the function. */
struct gdbarch_tdep
{
virtual ~gdbarch_tdep() = default;
};
/* The architecture associated with the inferior through the
connection to the target.
@ -157,7 +165,7 @@ static inline TDepType *
gdbarch_tdep (struct gdbarch *gdbarch)
{
struct gdbarch_tdep *tdep = gdbarch_tdep_1 (gdbarch);
return static_cast<TDepType *> (tdep);
return gdb::checked_static_cast<TDepType *> (tdep);
}
/* Mechanism for co-ordinating the selection of a specific